Car comparison

BMW 8 Series Convertible (G14) 840i · Stage 3vsBMW 8 Series Convertible (G14) 840i · Stage 2vsBMW 8 Series Convertible (G14) 840i · Stage 1vsBMW 8 Series Convertible (G14) 840i

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison
BMW logo

BMW 8 Series Convertible (G14)

840i (Stage 3)

510 hp2998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2019-2020
VS
BMW logo

BMW 8 Series Convertible (G14)

840i (Stage 2)

442 hp2998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2019-2020
VS
BMW logo

BMW 8 Series Convertible (G14)

840i (Stage 1)

401 hp2998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2019-2020
VS
BMW logo

BMW 8 Series Convertible (G14)

840i

340 hp2998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2019-2020

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp

  • Quickest 0-100 km/h
    4.1 s
  • Fastest top speed
    292 km/h
    181 mph
  • Most powerful
    510 hp
    380 kW
  • Highest torque
    775 Nm
    572 lb-ft
  • Lightest
    1,830 kg
    4,034 lb
  • Best power-to-weight
    279 hp/t
    208 kW/t
    3.6 kg/hp
  • Lowest combined fuel consumption
    7.5 L/100 km
    31.4 mpg US
    37.7 mpg UK
  • Lowest city consumption
    9.3 L/100 km
    25.3 mpg US
    30.4 mpg UK
  • Lowest highway consumption
    6.4 L/100 km
    36.8 mpg US
    44.1 mpg UK
  • Best estimated range
    907 km
    563 mi
  • Largest trunk
    280 L
  • Best overall score
    74/100
  • Best performance score
    88/100
  • Best economy score
    87/100
  • Best practicality score
    44/100

Specification comparison

Specification comparison
ModelBMW8 Series Convertible (G14)840i (Stage 3)510 hpBMW8 Series Convertible (G14)840i (Stage 2)442 hpBMW8 Series Convertible (G14)840i (Stage 1)401 hpBMW8 Series Convertible (G14)840i340 hp
Power
510hp380kW+170 hp
442hp330kW+102 hp
401hp299kW+61 hp
340hp254kW
Torque
775Nm572lb-ft+275 Nm
675Nm498lb-ft+175 Nm
610Nm450lb-ft+110 Nm
500Nm369lb-ft
Curb weight
1,830kg4,034lb
1,830kg4,034lb
1,830kg4,034lb
1,830kg4,034lb
Gross weight
2,340kg5,159lb
2,340kg5,159lb
2,340kg5,159lb
2,340kg5,159lb
Top speed
292 km/h
181 mph
+32 km/h
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
+30 km/h
Calculated
273 km/h
170 mph
+13 km/h
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
58.3s99% target: 289 km/h / 180 mph-15.7 s
Calculated
67.1s99% target: 287 km/h / 178 mph-6.8 s
Calculated
67.8s99% target: 270 km/h / 168 mph-6.1 s
Calculated
73.9s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.1s-1.2 s
4.5s-0.8 s
4.8s-0.5 s
5.3s
0-200 km/h
12.6s-6.7 s
Calculated
14.2s-5.1 s
Calculated
16.2s-3.2 s
Calculated
19.4s
Calculated
0-60 mph
3.9s-1.1 s
Calculated
4.3s-0.7 s
Calculated
4.5s-0.5 s
Calculated
5.0s
Calculated
Fuel consumption
7.5L/100 km31.4mpg US37.7mpg UK
7.5L/100 km31.4mpg US37.7mpg UK
7.5L/100 km31.4mpg US37.7mpg UK
7.5L/100 km31.4mpg US37.7mpg UK
Fuel consumption city
9.3L/100 km25.3mpg US30.4mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
Fuel consumption highway
6.4L/100 km36.8mpg US44.1mpg UK
6.4L/100 km36.8mpg US44.1mpg UK
6.4L/100 km36.8mpg US44.1mpg UK
6.4L/100 km36.8mpg US44.1mpg UK
Quarter mile
12.0s-1.4 s
Calculated
12.5s-1.0 s
Calculated
12.9s-0.6 s
Calculated
13.4s
Calculated
Power-to-weight
279hp/t208kW/t126hp/1000 lb
Calculated
242hp/t180kW/t110hp/1000 lb
Calculated
219hp/t163kW/t99hp/1000 lb
Calculated
186hp/t139kW/t84hp/1000 lb
Calculated
Torque-to-weight
423Nm/t283lb-ft/ton
Calculated
369Nm/t247lb-ft/ton
Calculated
333Nm/t223lb-ft/ton
Calculated
273Nm/t183lb-ft/ton
Calculated
Estimated range
907km563mi
Calculated
907km563mi
Calculated
907km563mi
Calculated
907km563mi
Calculated
Displacement
2,998cc183cu in
2,998cc183cu in
2,998cc183cu in
2,998cc183cu in
Length
4,843mm191in
4,843mm191in
4,843mm191in
4,843mm191in
Width
1,902mm75in
1,902mm75in
1,902mm75in
1,902mm75in
Height
1,339mm53in
1,339mm53in
1,339mm53in
1,339mm53in
Wheelbase
2,822mm111in
2,822mm111in
2,822mm111in
2,822mm111in
Front track
1,627mm64in
1,627mm64in
1,627mm64in
1,627mm64in
Rear track
1,642mm65in
1,642mm65in
1,642mm65in
1,642mm65in
Ground clearance
118mm5in
118mm5in
118mm5in
118mm5in
Trunk volume
280L
280L
280L
280L
Max trunk volume
350L
350L
350L
350L
Doors
2
2
2
2
Seats
4
4
4
4
Fuel tank
68L
68L
68L
68L

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hpBMW 8 Series Convertible (G14) 840i (Stage 2) 442 hpBMW 8 Series Convertible (G14) 840i (Stage 1) 401 hpBMW 8 Series Convertible (G14) 840i 340 hpPowerTorque
  • BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp: Power / Torque
  • BMW 8 Series Convertible (G14) 840i (Stage 2) 442 hp: Power / Torque
  • BMW 8 Series Convertible (G14) 840i (Stage 1) 401 hp: Power / Torque
  • BMW 8 Series Convertible (G14) 840i 340 hp: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW8 Series Convertible (G14)840i (Stage 3)510 hp5,000-6,500 rpm1,600-4,500 rpm6,750 rpm
BMW8 Series Convertible (G14)840i (Stage 2)442 hp5,000-6,500 rpm1,600-4,500 rpm6,750 rpm
BMW8 Series Convertible (G14)840i (Stage 1)401 hp5,000-6,500 rpm1,600-4,500 rpm6,750 rpm
BMW8 Series Convertible (G14)840i340 hp5,000-6,500 rpm1,600-4,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW8 Series Convertible (G14)840i (Stage 3)510 hpBMW8 Series Convertible (G14)840i (Stage 2)442 hpBMW8 Series Convertible (G14)840i (Stage 1)401 hpBMW8 Series Convertible (G14)840i340 hp
Acceleration checkpoints
0-60 mph
0-97 km/h
3.9 s
4.3 s
4.5 s
5.0 s
0-100 km/h
0-62 mph
4.1 s
4.5 s
4.8 s
5.3 s
0-200 km/h
0-124 mph
12.6 s
14.2 s
16.2 s
19.4 s
Top speed
292 km/h
181 mph
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
Likely limited
273 km/h
170 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.1 s
2.1 s
2.1 s
2.2 s
330 ft
101 m
5.3 s
5.5 s
5.6 s
5.8 s
1/8 mile
201 m
7.9 s
8.2 s
8.4 s
8.8 s
1000 ft
305 m
10.2 s
10.6 s
10.8 s
11.3 s
1/4 mile
402 m
12.0 s
12.5 s
12.9 s
13.4 s
Trap speed
1/4 mile
402 m
195 km/h
121 mph
188 km/h
117 mph
180 km/h
112 mph
171 km/h
106 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp has 170 hp more than BMW 8 Series Convertible (G14) 840i 340 hp.

The biggest power difference is between BMW 8 Series Convertible (G14) 840i 340 hp and BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp: 170 hp (127 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
292 km/h
181 mph
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
273 km/h
170 mph
BMW8 Series Convertible (G14)840i340 hp
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

The biggest 0-100 km/h difference is between BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp and BMW 8 Series Convertible (G14) 840i 340 hp: 1.2 s.

The closest cars by acceleration are BMW 8 Series Convertible (G14) 840i (Stage 2) 442 hp and BMW 8 Series Convertible (G14) 840i (Stage 1) 401 hp, separated by only 0.3 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i340 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
279 hp/t
208 kW/t
3.6 kg/hp
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
242 hp/t
180 kW/t
4.1 kg/hp
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
219 hp/t
163 kW/t
4.6 kg/hp
BMW8 Series Convertible (G14)840i340 hp
186 hp/t
139 kW/t
5.4 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
510 hp
380 kW
4.1 s
292 km/h
181 mph
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
442 hp
330 kW
4.5 s
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
401 hp
299 kW
4.8 s
273 km/h
170 mph
BMW8 Series Convertible (G14)840i340 hp
340 hp
254 kW
5.3 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
Power
510 hp
380 kW
0-100 km/h4.1 s
Top speed
292 km/h
181 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
Power
442 hp
330 kW
0-100 km/h4.5 s
Top speed
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
Power
401 hp
299 kW
0-100 km/h4.8 s
Top speed
273 km/h
170 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
BMW8 Series Convertible (G14)840i340 hp
Power
340 hp
254 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
Power
510 hp
380 kW
0-100 km/h4.1 s
Top speed
292 km/h
181 mph
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
Power
442 hp
330 kW
0-100 km/h4.5 s
Top speed
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
Power
401 hp
299 kW
0-100 km/h4.8 s
Top speed
273 km/h
170 mph
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i340 hp
Power
340 hp
254 kW
0-100 km/h5.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.5 L/100 km
31.4 mpg US
37.7 mpg UK

BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
4.1 s
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
4.5 s
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
4.8 s
BMW8 Series Convertible (G14)840i340 hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
5.3 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
BMW8 Series Convertible (G14)840i (Stage 3)510 hp
279 hp/t
208 kW/t
3.6 kg/hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 2)442 hp
242 hp/t
180 kW/t
4.1 kg/hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i (Stage 1)401 hp
219 hp/t
163 kW/t
4.6 kg/hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
BMW8 Series Convertible (G14)840i340 hp
186 hp/t
139 kW/t
5.4 kg/hp
7.5 L/100 km
31.4 mpg US
37.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW8 Series Convertible (G14)840i (Stage 3)510 hpBMW8 Series Convertible (G14)840i (Stage 2)442 hpBMW8 Series Convertible (G14)840i (Stage 1)401 hpBMW8 Series Convertible (G14)840i340 hp
Power
510 hp
380 kW
442 hp
330 kW
401 hp
299 kW
340 hp
254 kW
Torque
775 Nm
572 lb-ft
675 Nm
498 lb-ft
610 Nm
450 lb-ft
500 Nm
369 lb-ft
Acceleration
4.1 s
4.5 s
4.8 s
5.3 s
Top speed
292 km/h
181 mph
Unrestricted
290 km/h180 mph
Restricted
280 km/h174 mph
273 km/h
170 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,830 kg
4,034 lb
1,830 kg
4,034 lb
1,830 kg
4,034 lb
1,830 kg
4,034 lb
Fuel consumption
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
7.5 L/100 km
31.4 mpg US
37.7 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,843 mm
190.7 in
Height
1,339 mm
52.7 in
Range score
907 km
563 mi
907 km
563 mi
907 km
563 mi
907 km
563 mi
Trunk score
280 L
9.9 cu ft
280 L
9.9 cu ft
280 L
9.9 cu ft
280 L
9.9 cu ft
Power-to-weight score
279 hp/t
208 kW/t
3.6 kg/hp
242 hp/t
180 kW/t
4.1 kg/hp
219 hp/t
163 kW/t
4.6 kg/hp
186 hp/t
139 kW/t
5.4 kg/hp
Overall
Fixed score
Fixed score
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleBMW 8 Series Convertible (G14) 840i (Stage 3) 510 hpBMW 8 Series Convertible (G14) 840i (Stage 2) 442 hpBMW 8 Series Convertible (G14) 840i (Stage 1) 401 hpBMW 8 Series Convertible (G14) 840i 340 hp
Consumption7.5 L/100 km31.4 mpg US37.7 mpg UK7.5 L/100 km31.4 mpg US37.7 mpg UK7.5 L/100 km31.4 mpg US37.7 mpg UK7.5 L/100 km31.4 mpg US37.7 mpg UK
Cost / 100 km13.13 LC100 km13.13 LC100 km13.13 LC100 km13.13 LC100 km
Cost / 100 mi21.12 LC100 mi21.12 LC100 mi21.12 LC100 mi21.12 LC100 mi
Annual fuel used1,125 L297 US gal247 UK gal1,125 L297 US gal247 UK gal1,125 L297 US gal247 UK gal1,125 L297 US gal247 UK gal
Annual fuel cost1,969 LC/year1,969 LC/year1,969 LC/year1,969 LC/year

Head-to-head comparisons

BMW 8 Series Convertible (G14) 840i (Stage 3) 510 hp

  • Has 68 hp more
  • Has 100 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Has 2 km/h (1 mph) higher top speed
  • Has 37 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range
  • Largest trunk

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BMW 8 Series Convertible (G14) 840i
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Popular comparisons

BMW 8 Series Convertible (G14) 840i · Stage 3 vs BMW 8 Series Convertible (G14) 840i · Stage 2 vs BMW 8 Series Convertible (G14) 840i · Stage 1 vs BMW 8 Series Convertible (G14) 840i - car comparison - FastVsFaster